Imagine you’re in a bar, discussing the upcoming election with your friends. You admit you’re undecided. In fact, you can see both sides of the argument. They stare back at you as though you’ve just said you’d like to murder baby pandas.

When Theresa May became UK prime minister she inherited many contentious issues on the international stage, thanks to the British vote to leave the EU. But the diplomatic matter to cause her real problems concerned nuclear power.